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5
10. or 45. depending on if we're connecting them to adjacent corners or to every other corner
56 posts are needed for the fence
Every pentagon, regular or not, has five interior angles and five exterior angles.
It is a polyhedron with a pentagonal base. To every side of the pentagon are attached triangles that meet at a single point in a plane higher than the pentagon (if it is a skew pyramid, the apex will not be above the pentagon).
10
10
5
10. or 45. depending on if we're connecting them to adjacent corners or to every other corner
No. But if you restrict yourself to regular pentagons, then all regular pentagons are similar.
56 posts are needed for the fence
Every pentagon is a polygon, by definition - no matter what its angles are.
Every pentagon, regular or not, has five interior angles and five exterior angles.
You can't have a rectangular pentagon. Perhaps you mean regular? In any case every pentagon has 5 sides ("penta" = "five")
Round Every Corner was created in 1965-07.
Not necessarily. Every side of a regular pentagon is the same length, but there is an infinite variety of irregular pentagons in which no two sides are the same length.
Love's on Every Corner was created on 1992-11-30.